I use mandrake 10.0 and i am trying to use the 2.6.5. kernel.
I know that i need a patch 2 apply so that supermount is activated. I went to http://supermount-ng.sourceforge.net/ and saw that 2.6.5 kernel patch was not there.
I've applied the 2.6.3 supermount patch and tried to recompile my kernel. Here is what i did

make mrproper
make clean
make xconfig ( Supermount was there and i chose it )
and during make i get this error

CC fs/filesystems.o
CC fs/namespace.o
fs/namespace.c: In function `do_mount':
fs/namespace.c:785: error: `FS_NO_SUBMNT' undeclared (first use in this function)
fs/namespace.c:785: error: (Each undeclared identifier is reported only once
fs/namespace.c:785: error: for each function it appears in.)
make[1]: *** [fs/namespace.o] Error 1
make: *** [fs] Error 2

And it stops
(!!!)
Do i need another supermount patch 4 my 2.6.5 kernel and if yes from where can i get it?

I think you need to apply a 2.6.3 patch to a 2.6.3 kernel. Then use a 2.6.4 patch to make the kernel into a 2.6.4 kernel and the patch again with a 2.6.5 patch. I applied the supermount patch when my kernel was at 2.6.2 as that was the version of the patch I downloaded.

i'm using supermount and 2.6.5. try using a fuzz factor of 3 (patch -F3).